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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

Filters (None)
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+5 −0
How can I properly type-hint methods in different files that would lead to circular imports?

I am writing a Python package where I have two classes in different files that (indirectly) depend on each other. If I wouldn't care about type-hints, there would be no problem, but unfortunately,...

2 answers  ·  posted 9mo ago by mr Tsjolder‭  ·  edited 9mo ago by Alexei‭

77%
+5 −0
How to trigger an error/warning immediately upon compile/run if an item on my class-path is missing

I have a very simple source file -- HelloWorld.java public class HelloWorld { public static void main(String[] args) { System.out.println("hello world"); } } I have th...

0 answers  ·  posted 9mo ago by davidalayachew‭  ·  edited 9mo ago by davidalayachew‭

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+5 −0
How to create and manipulate (read/write) Excel (XLSX) documents with complex rules using general programming languages?

Our organization (blindness non-profit in California) is obligated to submit reports to grant organizations (e.g., Department of Rehabilitation) on a regular basis. Most of the time, this means exp...

1 answer  ·  posted 6mo ago by toraritte‭  ·  last activity 6mo ago by toraritte‭

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+5 −0
When should I parenthesize macro arguments in C?

I've seen macros use parentheses to enclose its arguments. Most of these make sense, as in #define sum(a, b) ((a) + (b)) The outer prevents the following: #define sum_bad(a, b) (a) + (b) ...

2 answers  ·  posted 6mo ago by alx‭  ·  last activity 6mo ago by Lundin‭

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+5 −0
Terms for types of functions with respect to side effects

Mathematically, the purpose of a function is to return an output. However, in a programming context functions often have side effects. It is even common to call functions for the side effects alone...

2 answers  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by Lundin‭

76%
+8 −1
Styling with classes vs styling with CSS

I've noticed that a lot of sites have something like this going on: <div class="has-margin-0 has-padding-4"> <div>...</div> <div>...</div> ... </div>...

1 answer  ·  posted 3y ago by Moshi‭  ·  last activity 3y ago by luap42‭

75%
+4 −0
How do I get IIS UrlRewrite to handle CSS-delivered woff files appropriately?

Context: Azure; Windows Server 2012; IIS 8 First up, here's the (redacted) web.config for reference <rewrite> <rules> <rule name="ReverseProxyInboundRule1" stopProcessing="false"&...

0 answers  ·  posted 4y ago by bugmagnet‭  ·  edited 3y ago by Alexei‭

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+4 −0
What is a standard definition (or a CS theory based formal definition) for Escaping?

I personally would define "escaping" in software development in general and coding in particular as follows: Making an exception to match data which otherwise would not be allowed to be matched: I...

1 answer  ·  posted 4y ago by deleted user  ·  edited 3y ago by Alexei‭

75%
+4 −0
Would a MySQL database run more efficiently with smaller varchar lengths?

I have a database with quite a few VARCHAR fields. When the database was first built the lengths of the columns were set a bit larger than absolutely necessary. Now after, having used the DB for a ...

3 answers  ·  posted 3y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by manassehkatz‭

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+10 −2
What are the pros and cons of a composite primary key versus a unique constraint?

Let's say we have two tables A and B and a join table C that has foreign keys to both A and B and the combination of those foreign keys is unique. One could either do a unique constraint or a comp...

2 answers  ·  posted 3y ago by Charlie Brumbaugh‭  ·  edited 3y ago by Alexei‭

75%
+4 −0
Generate SIGSEGV without undefined behaviour.

In order to test that coredumps are generated and that they contain useful information which can be retreived with gdb I need to generate a SIGSEGV. Or anything else which causes a coredump. The co...

1 answer  ·  posted 3y ago by Estela‭  ·  last activity 3y ago by Lundin‭

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+4 −0
Is there an equivalent way of returning early in a MySQL stored procedure?

In programming instead of arrowcode where one has many layers of indented if statements, you can return a result as soon as possible. So instead of, if if end if end if It looks like if ret...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  edited 3y ago by Moshi‭

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+4 −0
dig -6 works but dig -4 does not

I can't get a response from IPv4 dig on my server but I can get one from IPv6 dig. See the below output: $ dig +short myip.opendns.com a @resolver1.opendns.com # Doesn't return anything, this used ...

1 answer  ·  posted 3y ago by cobertos‭  ·  last activity 3y ago by Canina‭

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+4 −0
Implementing impersonation in an ASP.NET Core Web application

I am working at a proof-of-concept for porting an ASP.NET MVC application to an ASP.NET Core API + Angular SPA. One of the features of the existing application is the ability of an admin (typically...

0 answers  ·  posted 3y ago by Alexei‭

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+4 −0
How can I generate documentation from comments in SQL DDL?

I have some SQL scripts that contain DDL to create tables and schemas for a database. I'd like to be able to comment this SQL and then use those comments to generate output documentation (in HTML)...

0 answers  ·  posted 3y ago by Monica Cellio‭  ·  edited 3y ago by Monica Cellio‭

75%
+4 −0
Readable syntax for executing many callables with useful side effects

In Python, multiprocessing is easy to do if you follow a "list projection" paradigm. Say you want to take a list of inputs X and apply some function f to every x_i, such that y_i = f(x_i) and the y...

1 answer  ·  posted 9mo ago by matthewsnyder‭  ·  last activity 9mo ago by mr Tsjolder‭

75%
+4 −0
Set transform of SVG element

I'm trying to set the transform attribute of a group within an SVG. Specifically, I'd like to set translate's value to 0 0. I tried using the set element for this but that didn't have an observab...

1 answer  ·  posted 7mo ago by Matthias Braun‭  ·  edited 7mo ago by Matthias Braun‭

svg
75%
+4 −0
Can you run Python code on text in VS Code?

In VS Code, is it possible to run Python code on the text being edited? I realize that I can save my text, create a .py file, switch to a terminal (including VS Code's own terminal) and run the .p...

1 answer  ·  posted 7mo ago by matthewsnyder‭  ·  last activity 4d ago by Alexei‭

75%
+4 −0
Is it possible to re-export types similar to JS?

I'm writing a library "MyLibrary". In there, I group code into sections that make sense. Let's say I have a folder "Reports" and a folder "Helpers". I would like to have my code separated while ...

1 answer  ·  posted 8mo ago by raphaelschmitz‭  ·  last activity 6mo ago by raphaelschmitz‭

c#
75%
+4 −0
How to pass command line arguments when using cargo run?

When developing a rust program you build and run using cargo run. However you cannot just append arguments to that as they will be caught (and likely rejected) by cargo itself. So how to pass argum...

1 answer  ·  posted 8mo ago by Iizuki‭  ·  edited 3mo ago by Alexei‭

75%
+4 −0
Replace leaf arrays with joined strings in a nested structure in jq

Consider the following arbitrarily-nested JSON as input to a jq filter: echo '[{"foo": [1, 2]}, {"bar": [{"baz": ["foo", "baz"]}]}]' | jq '.' My goal is to join leaf arrays into strings: [{"fo...

1 answer  ·  posted 9mo ago by ggorlen‭  ·  edited 8mo ago by ggorlen‭

75%
+4 −0
Simplest way of getting failure notification emails from kubernetes

What would be the simplest (and most lightweight) way of getting email notifications of failures in kubernetes clusters. Mostly interested in failing pods, so notifying on certain kubernetes event ...

1 answer  ·  posted 2mo ago by Iizuki‭  ·  last activity 2mo ago by Iizuki‭

75%
+4 −0
What is a reasonable minimum for making a FOSS project inviting to contributors?

A lot of people who maintain FOSS projects would like to get more contributions. What can the maintainer do to ensure that potential contributors are converted into actual contributors? There are...

2 answers  ·  posted 2mo ago by matthewsnyder‭  ·  last activity 2mo ago by Michael‭

75%
+4 −0
Why does bash seem to parse `sh -c` commands differently when called via `execl`?

When I do this in a shell: $ /bin/sh -c 'echo hello world' hello world it's my understanding that I'm running a process with argv = {"/bin/sh", "-c", "echo hello world"}. That is, the quotes c...

1 answer  ·  posted 2mo ago by Emily‭  ·  last activity 2mo ago by Emily‭

75%
+4 −0
Why does `Zip` require `Semialign`

The Zip class from Data.Zip requires an implementation of Semialign: class Semialign f => Zip f In my mind: Zip takes the intersection of two shapes. Semialign takes the union of two sha...

1 answer  ·  posted 3mo ago by WheatWizard‭  ·  last activity 3mo ago by r~~‭

75%
+4 −0
How do you add "Sign In with Google" to a Ruby on Rails web application that is using the Devise authentication framework?

I want to add the ability to "Sign in with Google" into a Ruby on Rails web application, that is using Devise to handle authentication. How do I do that?

1 answer  ·  posted 3mo ago by Julius H.‭  ·  last activity 3mo ago by Julius H.‭

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+4 −0
Is there any rationale for the lack of local constants in PHP?

The last few years, PHP has basically exploded with lots of modern language constructs that makes the life easier. But local constants are still missing, and I find that very strange. I have found...

0 answers  ·  posted 3mo ago by klutt‭

php
75%
+4 −0
Why is global evil?

Many languages discourage global variables. Why is this?

3 answers  ·  posted 2mo ago by matthewsnyder‭  ·  last activity 2mo ago by mavavilj‭

75%
+4 −0
How to troubleshoot ModuleNotFoundError?

I ran some Python code and it crashed with ModuleNotFoundError. What is the general approach for dealing with these situations?

2 answers  ·  posted 4mo ago by matthewsnyder‭  ·  last activity 4mo ago by Karl Knechtel‭

75%
+4 −0
How to run Gitlab CI jobs only in specific branches?

By default Gitlab CI jobs run on any commit. I would like to restrict some of them to run only on commits to specific branches. How to do this in .gitlab-ci.yml?

1 answer  ·  posted 6mo ago by Iizuki‭  ·  last activity 6mo ago by Iizuki‭

75%
+4 −0
Wikidata: How do I ask for the start date of a property in SPARQL?

I have a SPARQL query to Wikidata that returns the names and handles and parties of politicians for whom a Mastodon address is stored at Wikidata. Filtered by nationality and with an output of the ...

0 answers  ·  posted 5mo ago by wasuko‭

75%
+4 −0
What does "namespace" mean?

A well-known easter egg in Python displays some ideas about writing good Python code, credited to Tim Peters (one of the core developers). This question is about the last: Namespaces are one hon...

2 answers  ·  posted 6mo ago by Karl Knechtel‭  ·  last activity 6mo ago by Olin Lathrop‭

75%
+4 −0
How to define custom configurations in new-style .csproj?

Problem I'm trying to update some projects from old-style .csproj: <?xml version="1.0" encoding="utf-8"?> <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.mi...

1 answer  ·  posted 3y ago by Peter Taylor‭  ·  last activity 2y ago by Peter Taylor‭

75%
+4 −0
Static and thread_local initialization order

Is there any guarantee regarding initialization of static and thread_local objects? In example, is there any guarantee about the value printed by the following program? #include<iostream> s...

1 answer  ·  posted 3y ago by Estela‭  ·  edited 3y ago by Alexei‭

75%
+4 −0
Resize HTML canvas with respect to inner content

I am currently making an esoteric language which requires a theoretically infinite canvas. Basically, it should be able to resize and fit the contents of the drawing in and outside it's existing bo...

0 answers  ·  posted 3y ago by Razetime‭

75%
+4 −0
Capture args from repeatable flags in Golang pflags package

How do I create a flag that can be used multiple times in a command using the pflag package? For example, let's say I wanted to select multiple fields and did not want to have to use comma-separati...

1 answer  ·  posted 3y ago by qohelet‭  ·  edited 3y ago by Alexei‭

75%
+4 −0
Is there a way to automatically fix MySQL tables where the auto_increment has fallen behind the correct value?

Due to a series of unfortunate events I have some tables where the auto_increment value got behind what it should be. If the auto_increment value is 9 and there are 20 rows in the table the next 1...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by Alexei‭

75%
+4 −0
Unable to `mount` overlayfs in Docker container when inside a LXC with a ZFS pool

Summary/Context I'm currently working to improve performance and throughput of our automation infrastructure, most of which is a combination of Bash/Shell scripts, Python scripts, Docker, Jenkins,...

1 answer  ·  posted 3y ago by ghost-in-the-zsh‭  ·  last activity 3y ago by ghost-in-the-zsh‭

75%
+4 −0
How to reason about transaction isolation during development

Consider the following code: public class OnlineShoppingService { @Transactional public void cancelOrder(String id) { if (shipmentRepository.findShipmentForOrder(id) != null) { ...

1 answer  ·  posted 3y ago by meriton‭  ·  last activity 3y ago by Alexei‭

75%
+4 −0
List what file(s) an identifier was declared in?

I'm using Doxygen to help me figure out some library code. There's an enum I know I need to use, but I don't know which file it's declared in. Searching for that identifier in Doxygen yields the p...

1 answer  ·  posted 3y ago by Hyperlynx‭  ·  last activity 3y ago by summea‭

75%
+4 −0
How can I add "withCredentials:true" for HTTP requests generated by Swagger UI?

I have added Swagger UI for an ASP.NET Core 3.1 application and I have realized that all endpoints requiring Windows Authentication fail. This issue is created by the fact that generated HTTP reque...

1 answer  ·  posted 3y ago by Alexei‭  ·  last activity 3y ago by Alexei‭

75%
+4 −0
Declaring interface members with generic return types: "The type parameter [generic type] cannot be used with type arguments"

I'm trying to write an interface to define the set of operations I expect my repositories' Unit of Work implementations to have, and I want this interface to be fulfilled by EF Core's DbContext cla...

2 answers  ·  posted 3y ago by Marc.2377‭  ·  last activity 3y ago by Marc.2377‭

75%
+4 −0
What are the risks of using iFrame as a temporary migration step for an internal web application?

Overview Our development team is currently trying to develop and migrate a Web application that is split in two: legacy: ASP.NET MVC 5, jQuery, old-style JS programming overall "next": Angular...

1 answer  ·  posted 3y ago by Alexei‭  ·  last activity 3y ago by meriton‭

75%
+4 −0
How to prompt a user for an expanded variable in Bash?

I work with CentOS operating system and my only shell is Bash. I want to create a script which prompts a user with a question like "What is your web application root?" The user should answer dire...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by Someone‭

75%
+4 −0
How can I customize the default project templates, or create my own, in Android Studio 4.2.1

I want to remove a deprecated entry from the default build.gradle file as well as change the default layout of an empty activity to use Relative Layout instead of constraint. I'm using Android Stu...

0 answers  ·  posted 3y ago by TecBrat‭

75%
+4 −0
How to generate multi-line completions (code generation) with OpenAI?

I have finally received access to a trial account on OpenAI and I took it for a spin. My interest is with code generation, so first tried something simple using the playground: Q: generate a stand...

1 answer  ·  posted 3y ago by Alexei‭  ·  edited 3y ago by deleted user

75%
+4 −0
Changing the font of a certain cell within a JTable

I am trying to change the font type and size in a JTable cell. Ive looked at tons of posts and while most don't produce stack traces, they don't seem to do anything either. Here is the code I curr...

1 answer  ·  posted 3y ago by cuzzo‭  ·  edited 3y ago by cuzzo‭

75%
+4 −0
Pros and Cons of different tacit systems?

As a big fan of tacit/point-free programming in general, I'm looking at different tacit programming systems for inspiration (for a language I'm creating). What are the advantages and disadvantages ...

0 answers  ·  posted 3y ago by Wezl‭  ·  edited 3y ago by Wezl‭

75%
+4 −0
How do I communicate with a subproject in qmake?

When working with a qmake subdirs project you may want to share configuration between multiple projects. In a less common case you may including a external project within your own as code and want ...

1 answer  ·  posted 3y ago by dmckee‭  ·  last activity 3y ago by dmckee‭

75%
+4 −0
Get the length of a slice from a multi-dimensional array

If I have a one-dimensional array, I can get the length of it quite easily: var x = moves.Length(). However, if the array is multi-dimensional, .Length() returns the total number of elements. If ...

2 answers  ·  posted 2y ago by FrankLuke‭  ·  last activity 2y ago by FoggyFinder‭